package com.jianjian.controller;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 *  替换HttpServlet，根据请求的最后一行路径进行方法分发
 * @author Zsir
 * @create 2021-12-06 21:32
 */
public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1.获取请求路径
        String uri = req.getRequestURI();

        //2.获取最后一段路径
        int index=uri.lastIndexOf("/");
        String methodName = uri.substring(index + 1);

           //2.1获取对应的BrandServlet
        Class<? extends BaseServlet> aClass = this.getClass();
        try {
            //2.3执行方法
            Method method = aClass.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }


    }
}
